Automatically adjusting tensioning mechanism and PVC film winding device containing the same

Abstract

The present invention discloses an automatic adjustment tensioning mechanism and a PVC film winding device containing the same. A driving arm mechanism is movably connected between the two ends of a first tensioning roller and a second tensioning roller. Under the drive of a moving mechanism on which two sets of vertical plates are slidably connected, the driving arm mechanism can adjust the distance between the first tensioning roller and the second tensioning roller. A first guide roller and a second guide roller distributed up and down are connected in the middle between the two sets of vertical plates. A bracket is vertically slidably connected at the rear between the two sets of vertical plates, a winding roller is installed on the top of the bracket through a clamping mechanism, and a rotating lifting mechanism is provided on the outer wall of the rear of the vertical plate. When the moving mechanism moves forward, the rotating lifting mechanism is pulled to rotate by a limiting mechanism on which a transverse plate is slidably connected, so that the bracket drives the winding roller to move up to tension the PVC film. The present invention can realize the tensioning of the PVC film by the first tensioning roller, the second tensioning roller and the winding roller at the same time through the operation of the moving mechanism, so that the speed of tensioning the PVC film can be improved, and the tensioning efficiency is high.

Description

Technical Field

[0001] The invention relates to the technical field of PVC film winding, in particular to an automatic adjustment tensioning mechanism and a PVC film winding device containing the same. Background Art

[0002] After production, PVC film needs to be wound up using a winding device. In order to make the PVC film tightly wound on the winding roller, a tensioning adjustment mechanism will be set on the winding device. By changing the distance between the tensioning rollers, the tension of the PVC film can be adjusted, thereby adjusting the tightness of the winding roller on the PVC film. Therefore, the tensioning adjustment mechanism is an important component of the winding equipment.

[0003] However, in common tensioning adjustment mechanisms, multiple tensioning rollers are often provided. If a single tensioning roller is adjusted, the adjustment efficiency will be reduced, and when it is necessary to slowly change the tension of the PVC film through fine-tuning, there is a lack of fine-tuning means. For this reason, we have introduced an automatic tensioning mechanism and a PVC film winding device containing the same. Summary of the invention

[0004] The object of the present invention is to provide an automatic adjusting tensioning mechanism and a PVC film winding device containing the same, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An automatic tensioning mechanism includes vertical plates fixed at both ends of a horizontal plate, a first tensioning roller and a second tensioning roller distributed up and down are connected to the front between the two sets of vertical plates, and a driving arm mechanism is movably connected between the two ends of the first tensioning roller and the second tensioning roller, which is driven by a moving mechanism of the two sets of vertical plates slidingly connected to adjust the distance between the first tensioning roller and the second tensioning roller, thereby adjusting the tensioning force of the PVC film;

[0007] The middle part between the two groups of vertical plates is connected with a first guide roller and a second guide roller distributed up and down. A bracket is vertically slidably connected at the rear between the two groups of vertical plates, and a winding roller is installed on the top through a clamping mechanism. A rotating jacking mechanism is provided on the outer wall of the rear of the vertical plate. When the moving mechanism moves forward, the rotating jacking mechanism is pulled to rotate through the limiting mechanism sliding on the horizontal plate, so that the bracket drives the winding roller to move upward to tension the PVC film.

[0008] When the bracket is moved to the highest position, the clamping mechanism automatically opens, and after the winding roller shaft that passes through the middle of the winding roller is placed inside the clamping mechanism, the clamping mechanism automatically closes under the action of the gravity of the winding roller, thereby clamping the winding roller shaft;

[0009] When the rotating mechanism at the rear end of the limiting mechanism rotates, the rotating lifting mechanism is pulled to rotate, so that the bracket drives the winding roller to move upward to tension the PVC film.

[0010] Preferably, mounting plates are provided at both ends of the horizontal plate, which are fixed to the inner wall of the vertical plate by bolts. The moving mechanism includes a cylinder body installed in the middle of the upper end of the horizontal plate, a horizontal frame connected to the output end of the cylinder body, a connecting seat provided at the front end of the horizontal frame, and a sliding seat connected to the bottom of both ends of the horizontal frame. The sliding seat is slidably connected to the first sliding groove on the side wall of the vertical plate.

[0011] The driving arm mechanism comprises a first sleeve sleeved on a first shaft rod at both ends of a first tensioning roller, a first connecting ring connected to the lower end of the first sleeve by a first connecting arm, a second sleeve sleeved on a second shaft rod at both ends of a second tensioning roller, and two sets of second connecting rings connected to the upper end of the second sleeve by a second connecting arm;

[0012] The first connecting ring is movably connected between the two sets of second connecting rings through a connecting pin, and both ends of the connecting pin extend through both sides of the connecting seat;

[0013] The front side walls of the two groups of vertical plates are provided with vertical grooves, and the first shaft rod and the second shaft rod extend into the vertical grooves.

[0014] Preferably, the limiting mechanism includes two groups of limiting seats arranged in parallel, the front end of the limiting seat is provided with a U-shaped groove slidably connected to the cross plate, and the front end of the limiting seat is fixed with an end cover by screws, which is fixedly connected to the inner rear end of the corresponding sliding seat by a first rope.

[0015] The rotating mechanism includes a rotating shaft passing through the rear parts of the two sets of limit seats, one end of which passes through the second sliding groove on the corresponding vertical plate and is fixedly connected to a winding wheel, and the other end passes through the second sliding groove on the corresponding vertical plate and is fixed with a gear, a winding wheel and a hand wheel in sequence.

[0016] The vertical plate is provided with a third sliding groove located above the second sliding groove, and a moving plate is slidably connected inside, and a clamping tooth for clamping on the front end of the gear is provided at the rear end of the bottom of the moving plate.

[0017] Preferably, the rotating lifting mechanism comprises a rotating lifting arm movably connected to the outer side wall of the vertical plate through a pin shaft, and the front end of the bottom thereof is connected to the winding wheel through a second rope;

[0018] The top of the rear part of the vertical plate is provided with a notch, and two groups of front and rear vertical plates are provided inside the notch, and the vertical part of the bracket is slidably connected between the two groups of front and rear vertical plates, and a long rod is fixed inside the top of the rotating lifting arm, which is slidably connected in the fourth slide groove on the vertical part of the bracket;

[0019] A limiting plate is provided at the rear portion of the outer side of the notch, which is used to prevent the rotating lifting arm from continuing to rotate counterclockwise after the rotating lifting arm rotates to a vertical state.

[0020] Preferably, the clamping mechanism comprises a clamping seat, the rear side of the bottom of which is connected to the right-angle groove on the front side of the top end of the vertical part of the bracket through a spring, and the bottom of the clamping seat is movably connected between the two sets of connecting plates on the right-angle groove through a pin;

[0021] A clamping groove is provided on the rear end surface of the vertical part of the right-angle groove, an arc groove is provided on the rear end of the clamping seat, a supporting plate is fixed on the front end of the clamping seat, and a raised plate is provided on the front end of the top of the rear vertical plate, and the supporting plate is located below the raised plate.

[0022] In addition, in order to achieve the above-mentioned purpose, the present invention also provides a PVC film winding device, including the above-mentioned automatic adjustment tensioning mechanism.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: the driving arm mechanism movably connected between the two ends of the first tensioning roller and the second tensioning roller of the present invention is driven by the moving mechanism to adjust the distance between the first tensioning roller and the second tensioning roller, thereby adjusting the tensioning force of the PVC film;

[0024] At the same time, when the moving mechanism moves forward, the limit mechanism slidingly connected on the horizontal plate pulls the rotating lifting mechanism to rotate, so that the bracket drives the winding roller to move upward to tension the PVC film;

[0025] That is, through the operation of the moving mechanism, the first tensioning roller, the second tensioning roller and the winding roller can simultaneously tension the PVC film, which can increase the speed of tensioning the PVC film and increase the tensioning efficiency;

[0026] At the same time, when the bracket moves to the highest position, the clamping mechanism automatically opens, and after the winding roller shaft passing through the middle of the winding roller is placed inside the clamping mechanism, the clamping mechanism automatically closes under the action of the gravity of the winding roller to clamp the winding roller shaft, which is conducive to the installation or disassembly of the winding roller and is easy to use.

[0027] When the rotating mechanism at the rear end of the limiting mechanism rotates, the rotating lifting mechanism is pulled to rotate, so that the bracket drives the winding roller to move upward to tension the PVC film. That is, when the tensioning force of the first tensioning roller and the second tensioning roller on the PVC film is not yet at the maximum state, the moving mechanism is stopped at this time, so that the first tensioning roller, the second tensioning roller and the winding roller no longer further tension the PVC film at the same time, and then the rotating shaft and the winding wheel on the rotating shaft are driven to rotate by the hand wheel, so that the winding wheel winds up the second rope, thereby making the rotating lifting arm rotate counterclockwise with the pin shaft as the center of the circle, so that the long rod on the rotating lifting arm lifts the bracket upward. At this time, the long rod slides accordingly in the fourth slide groove, and the bracket gradually rises upward, so that the winding roller at its top gradually moves upward, so that the PVC film bypassed by the first guide roller is gradually tensioned, so that the tensioning force of the PVC film can be fine-tuned only by the winding roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the exploded structure of the overall assembly of the present invention;

[0029] Figure 2 It is a structural schematic diagram of the driving arm mechanism of the present invention;

[0030] Figure 3 It is a structural schematic diagram of the mobile mechanism of the present invention;

[0031] Figure 4 It is a schematic diagram of the three-dimensional structure of the connection between the driving arm mechanism of the present invention and the first tensioning roller and the second tensioning roller;

[0032] Figure 5 It is a schematic diagram of a three-dimensional structure of the connection between the first tensioning roller, the second tensioning roller, the driving arm mechanism and the moving mechanism of the present invention;

[0033] Figure 6 It is a side view structural schematic diagram of the connection between the first tensioning roller, the second tensioning roller, the driving arm mechanism, the moving mechanism and the transverse plate of the present invention;

[0034] Figure 7 It is a schematic diagram of the exploded structure of the limiting mechanism of the present invention;

[0035] Figure 8 It is a schematic diagram of a three-dimensional structure in which a horizontal plate and a vertical plate are connected in the present invention;

[0036] Fig. 9 It is a structural schematic diagram of the rotary lifting mechanism of the present invention;

[0037] Fig.10 It is a schematic diagram of the three-dimensional structure after the clamping mechanism and the bracket of the present invention are installed;

[0038] Fig.11 It is a schematic diagram of the exploded structure of the clamping mechanism and the bracket installation of the present invention;

[0039] Fig.12 It is a side view structural schematic diagram of the support of the present invention when it rises to the highest position;

[0040] Fig.13 It is a side view structural schematic diagram of the clamping mechanism of the present invention when clamping the winding roller shaft;

[0041] Fig.14 It is a schematic diagram of the three-dimensional structure of the connection between the moving mechanism, the horizontal plate, the limiting mechanism, the rotating lifting mechanism and the bracket of the present invention;

[0042] Fig.15 It is a side view structural schematic diagram of the connection between the first tensioning roller, the second tensioning roller, the first guide roller, the second guide roller, the winding roller and the PVC film of the present invention.

[0043] In the figure: 1, first tensioning roller; 101, first shaft; 2, second tensioning roller; 201, second shaft; 3, driving arm mechanism; 31, first sleeve; 32, first connecting arm; 33, first connecting ring; 34, second connecting ring; 35, connecting pin; 36, second connecting arm; 37, second sleeve; 4, moving mechanism; 41, cross frame; 42, cylinder; 43, connecting seat; 44, sliding seat; 45, first rope; 5, cross plate; 6, mounting plate; 7, first guide roller; 8, second guide roller; 9, winding roller; 901, winding roller shaft; 10, bracket; 1001, fourth slide slot; 1002, right angle slot; 1003, card slot; 11, rotating jacking mechanism; 111, rotating jacking Lifting arm; 112, pin shaft; 113, long rod; 114, second rope; 12, vertical plate; 121, vertical slot; 122, first slide slot; 123, second slide slot; 124, third slide slot; 125, bearing seat; 126, notch; 127, raised plate; 128, vertical plate; 129, limit plate; 13, clamping mechanism; 131, clamping seat; 132, abutting plate; 133, pin; 134, connecting plate; 135, arc slot; 136, spring; 14, limit mechanism; 141, rotating shaft; 142, limit seat; 143, U-shaped slot; 144, end cover; 145, screw; 15, winding wheel; 16, hand wheel; 17, gear; 18, moving plate; 19, latching tooth. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0045] See also Figure 1-15 , the present invention provides a technical solution: Embodiment 1

[0046] An automatic adjustment tensioning mechanism, comprising a vertical plate 12 fixed at both ends of a horizontal plate 5, wherein both ends of the horizontal plate 5 are provided with mounting plates 6, which are fixed to the inner wall of the vertical plate 12 by bolts;

[0047] The front part between the two groups of vertical plates 12 is connected with the first tensioning roller 1 and the second tensioning roller 2 distributed up and down, the middle part between the two groups of vertical plates 12 is connected with the first guide roller 7 and the second guide roller 8 distributed up and down, and the inner wall of the vertical plate 12 is provided with a bearing seat 125 distributed up and down, and the first shaft rod 101 and the second shaft rod 201 are respectively inserted into the bearings in the corresponding bearing seats 125, and the rear part between the two groups of vertical plates 12 is vertically slidably connected with a bracket 10, and the top of the bracket 10 is installed with a winding roller 9 through a clamping mechanism 13;

[0048] like Fig.15 As shown, the winding end of the PVC film passes through the top of the second guide roller 8 and the bottom of the first guide roller 7, and then passes through the top of the first tensioning roller 1 and the bottom of the first guide roller 7 and is connected to the winding roller 9. Under the control of the PLC controller, the servo motor is started, and the output end of the servo motor is connected to the winding roller shaft 901. The servo motor drives the winding roller 9 to rotate through the winding roller shaft 901 to realize the winding of the PVC film.

[0049] A driving arm mechanism 3 is movably connected between the two ends of the first tensioning roller 1 and the second tensioning roller 2. Driven by a moving mechanism 4 that is slidably connected to the two sets of vertical plates 12, the driving arm mechanism 3 can adjust the distance between the first tensioning roller 1 and the second tensioning roller 2, thereby adjusting the tensioning force on the PVC film.

[0050] like Figure 3 , 5 As shown in Figure 6, the moving mechanism 4 includes a cylinder body 42 installed in the middle of the upper end of the horizontal plate 5, a horizontal frame 41 connected to the output end of the cylinder body 42, a connecting seat 43 provided at the front end of the horizontal frame 41, and a sliding seat 44 connected to the bottom of both ends of the horizontal frame 41, and the sliding seat 44 is slidably connected to the first sliding groove 122 on the side wall of the vertical plate 12.

[0051] like Figure 2 , 4 As shown in FIGS. 5 and 6 , the driving arm mechanism 3 comprises a first sleeve 31 sleeved on the first shaft 101 at both ends of the first tensioning roller 1, a first connecting ring 33 connected at the lower end of the first sleeve 31 through a first connecting arm 32, a second sleeve 37 sleeved on the second shaft 201 at both ends of the second tensioning roller 2, and two sets of second connecting rings 34 connected at the upper end of the second sleeve 37 through a second connecting arm 36;

[0052] The first connecting ring 33 is movably connected between the two sets of second connecting rings 34 through a connecting pin 35, and both ends of the connecting pin 35 extend through both sides of the connecting seat 43;

[0053] A vertical groove 121 is formed on the front side walls of the two sets of vertical plates 12 , and the first shaft rod 101 and the second shaft rod 201 extend into the vertical groove 121 .

[0054] Under the control of the PLC controller, the cylinder body 42 (which is an electric cylinder) works, and the piston rod at its output end extends, driving the moving mechanism 4 to move forward. At this time, the sliding seat 44 of the moving mechanism 4 moves forward along the first slide groove 122, and the connecting seat 43 of the moving mechanism 4 pushes the first tensioning roller 1 and the second tensioning roller 2 through the first connecting arm 32 and the second connecting arm 36 respectively, and the first shaft rod 101 moves up along the vertical groove 121, and the second shaft rod 201 moves down along the vertical groove 121, so that the first connecting arm 32 and the second connecting arm 36 are opened, and the distance between the first tensioning roller 1 and the second tensioning roller 2 is increased, so that the PVC film bypassed by the first tensioning roller 1 and the second tensioning roller 2 is further tensioned.

[0055] A rotating lifting mechanism 11 is provided on the outer wall of the rear part of the vertical plate 12. When the moving mechanism 4 moves forward, the rotating lifting mechanism 11 is pulled to rotate by the limiting mechanism 14 slidingly connected on the horizontal plate 5, so that the bracket 10 drives the winding roller 9 to move upward to tension the PVC film.

[0056] like Figure 7 As shown, the limiting mechanism 14 includes two groups of limiting seats 142 arranged in parallel, and the front end of the limiting seat 142 is provided with a U-shaped groove 143 which is slidably connected to the cross plate 5, and the front end of the limiting seat 142 is fixed with an end cover 144 by a screw 145, which is fixedly connected to the inner rear end of the corresponding sliding seat 44 by a first rope 45.

[0057] The rotating mechanism includes a rotating shaft 141 that passes through the rear part of the two sets of limit seats 142, one end of which passes through the second sliding groove 123 on the corresponding vertical plate 12 and is fixedly connected to the winding wheel 15, and the other end passes through the second sliding groove 123 on the corresponding vertical plate 12 and is fixed with a gear 17, a winding wheel 15 and a hand wheel 16 in sequence.

[0058] like Fig. 9 As shown, the rotating lifting mechanism 11 includes a rotating lifting arm 111 movably connected to the outer wall of the vertical plate 12 through a pin shaft 112, and its bottom front end is connected to the winding wheel 15 through a second rope 114; a long rod 113 is fixed to the inner side of the top of the rotating lifting arm 111, which is slidably connected to the fourth slide groove 1001 on the vertical part of the bracket 10;

[0059] When the moving mechanism 4 moves forward, the limiting seat 142 of the limiting mechanism 14 is pulled forward by the first rope 45, so that the rotating shaft 141 on the limiting seat 142 moves forward along the second slide groove 123, so that the winding wheel 15 on the rotating shaft 141 pulls the second rope 114, so that the rotating lifting arm 111 rotates counterclockwise with the pin shaft 112 as the center, so that the long rod 113 on the rotating lifting arm 111 lifts the bracket 10 upward, and at this time, the long rod 113 slides accordingly in the fourth slide groove 1001;

[0060] After the bracket 10 is lifted up, the winding roller 9 on the top thereof moves upward, so that the PVC film bypassed by the first guide roller 7 is further tensioned.

[0061] When the bracket 10 moves to the highest position, the clamping mechanism 13 automatically opens, and after the winding roller shaft 901 passing through the middle of the winding roller 9 is placed inside the clamping mechanism 13, the clamping mechanism 13 automatically closes under the gravity of the winding roller 9, thereby clamping the winding roller shaft 901;

[0062] When the bracket 10 rises to the highest position, the abutting plate 132, under the abutting effect of the protruding plate 127, causes the clamping seat 131 to rotate clockwise around the pin 133, thereby increasing the gap between the clamping groove 1003 and the arc groove 135. At this time, the spring 136 is in a compressed state.

[0063] Then, the winding roller shaft 901 passing through the middle of the winding roller 9 is put into the gap between the clamping groove 1003 and the arc groove 135, and the winding roller shaft 901 is seated in the arc groove 135. Under the gravity of the winding roller 9, the clamping seat 131 rotates counterclockwise with the pin 133 as the center, so that the clamping groove 1003 and the arc groove 135 clamp the winding roller shaft 901.

[0064] When the rotating mechanism at the rear end of the limiting mechanism 14 rotates, the rotating lifting mechanism 11 is pulled to rotate, so that the bracket 10 drives the winding roller 9 to move upward to tension the PVC film.

[0065] When it is necessary to remove the winding roller 9, the moving mechanism 4 and the limiting mechanism 14 can be driven forward by the electric cylinder, and the rotating lifting mechanism 11 can be rotated to move the bracket 10 upward. When the bracket 10 is lifted to the highest position, the abutting plate 132, under the abutting action of the raised plate 127, causes the clamping seat 131 to rotate clockwise with the pin 133 as the center of the circle, thereby increasing the gap between the clamping groove 1003 and the arc groove 135, and lifting the winding roller 9 upward, so that the winding roller shaft 901 moves out of the gap between the clamping groove 1003 and the arc groove 135, and then the winding roller 9 is removed;

[0066] When it is necessary to remove the winding roller 9, the hand wheel 16 can also be used to drive the rotating shaft 141 and the winding wheel 15 on the rotating shaft 141 to rotate, so that the winding wheel 15 can realize the rotation of the rotating jacking mechanism 11 by winding the second rope 114, so that the bracket 10 moves up. When the bracket 10 rises to the highest position, the abutment plate 132, under the abutment of the raised plate 127, makes the clamping seat 131 rotate clockwise with the pin 133 as the center of the circle, so that the gap between the clamping groove 1003 and the arc groove 135 becomes larger, and the winding roller 9 is lifted upward, so that the winding roller shaft 901 moves out of the gap between the clamping groove 1003 and the arc groove 135, and then the winding roller 9 is removed; Embodiment 2

[0067] In this embodiment, if Figure 1 and 8 As shown, the vertical plate 12 is provided with a third slide groove 124 located above the second slide groove 123, and a moving plate 18 is slidably connected inside. The bottom rear end of the moving plate 18 is provided with a latching tooth 19 for latching on the front end of the gear 17.

[0068] The top of the rear portion of the vertical plate 12 is provided with a notch 126, and two sets of front and rear vertical plates 128 are provided inside the vertical plate 12, and the vertical portion of the bracket 10 is slidably connected between the two sets of front and rear vertical plates 128;

[0069] A limiting plate 129 is provided at the rear portion of the outer side of the notch 126 to prevent the rotating lifting arm 111 from continuing to rotate counterclockwise after the rotating lifting arm 111 rotates to a vertical state. Embodiment 3

[0070] In this embodiment, if Figure 8 As shown in 10-13, the clamping mechanism 13 includes a clamping seat 131, the rear side of the bottom of which is connected to the right-angle slot 1002 on the front side of the top end of the vertical portion of the bracket 10 through a spring 136, and the bottom of the clamping seat 131 is movably connected between two sets of connecting plates 134 on the right-angle slot 1002 through a pin 133;

[0071] A clamping groove 1003 is provided on the rear end surface of the vertical part of the right-angle groove 1002, an arc groove 135 is provided on the rear end of the clamping seat 131, a supporting plate 132 is fixed to the front end of the clamping seat 131, and a protruding plate 127 is provided on the front end of the top of the rear vertical plate 128, and the supporting plate 132 is located below the protruding plate 127.

[0072] In addition, in order to achieve the above-mentioned purpose, the present invention also provides a PVC film winding device, including the above-mentioned automatic adjustment tensioning mechanism.

[0073] Specifically, when in use, the cylinder body 42 works, and the piston rod at its output end extends, driving the moving mechanism 4 to move forward. At this time, the sliding seat 44 of the moving mechanism 4 moves forward along the first sliding groove 122, and the connecting seat 43 of the moving mechanism 4 pushes the first tensioning roller 1 and the second tensioning roller 2 through the first connecting arm 32 and the second connecting arm 36 respectively, and the first shaft rod 101 moves up along the vertical groove 121, and the second shaft rod 201 moves down along the vertical groove 121, so that the first connecting arm 32 and the second connecting arm 36 are opened, and the distance between the first tensioning roller 1 and the second tensioning roller 2 is increased, so that the PVC film bypassed by the first tensioning roller 1 and the second tensioning roller 2 is further tensioned.

[0074] At the same time, when the moving mechanism 4 moves forward, the limiting seat 142 of the limiting mechanism 14 is pulled forward by the first rope 45, so that the rotating shaft 141 on the limiting seat 142 moves forward along the second slide groove 123, so that the winding wheel 15 on the rotating shaft 141 pulls the second rope 114, so that the rotating lifting arm 111 rotates counterclockwise with the pin shaft 112 as the center, so that the long rod 113 on the rotating lifting arm 111 lifts the bracket 10 upward. At this time, the long rod 113 slides accordingly in the fourth slide groove 1001; after the bracket 10 is lifted upward, the winding roller 9 on its top moves upward, so that the PVC film bypassed by the first guide roller 7 is further tensioned.

[0075] The first tensioning roller 1 and the second tensioning roller 2 are arranged as follows Figure 4 In the state shown, the tensioning force on the PVC film is the largest, and the first tensioning roller 1 and the second tensioning roller 2 are in the state shown. Figure 6 In the state shown, the tensioning force on the PVC film is the smallest. At this time, the distance between the first tensioning roller 1 and the second tensioning roller 2 is in the initial state.

[0076] Since the cylinder 42 works, the first tensioning roller 1, the second tensioning roller 2 and the winding roller 9 can simultaneously tension the PVC film, which can increase the speed of tensioning the PVC film and increase the tensioning efficiency;

[0077] When the tensioning force of the first tensioning roller 1 and the second tensioning roller 2 on the PVC film is not yet at the maximum state, the cylinder body 42 can be stopped at this time, and the first tensioning roller 1, the second tensioning roller 2 and the winding roller 9 can be stopped from further tensioning the PVC film at the same time. Then, by turning the hand wheel 16, the tensioning force of the PVC film can be fine-tuned only by the winding roller 9, that is, the hand wheel 16 drives the rotating shaft 141 and the winding wheel 15 on the rotating shaft 141 to rotate, so that the winding wheel 15 winds up the second rope 114, thereby causing the rotating lifting arm 111 to rotate counterclockwise around the pin shaft 112 as the center of the circle, so that the long rod 113 on the rotating lifting arm 111 lifts the bracket 10 upward. At this time, the long rod 113 slides accordingly in the fourth slide groove 1001, and the bracket 10 gradually rises upward, so that the winding roller 9 at its top gradually moves upward, so that the PVC film bypassed by the first guide roller 7 is gradually tensioned.

[0078] Subsequently, the movable plate 18 is pushed backward so that the horizontal portion at the top of the movable plate 18 moves backward along the third slide groove 124 until the latch 19 contacts the front end of the gear 17, and the latch 19 is inserted into the tooth groove at the front end of the gear 17. This limits the rotation of the gear 17, so that the rotating shaft 141 and the winding wheel 15 on the rotating shaft 141 no longer rotate, and the winding wheel 15 will not reel in or release the second rope 114, thereby ensuring that the position of the bracket 10 is fixed, and ensuring that the position of the winding roller 9 at its top is fixed.

[0079] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic tensioning mechanism, comprising vertical plates fixed at both ends of a horizontal plate, characterized in that: The front part between the two groups of vertical plates is connected with a first tensioning roller and a second tensioning roller which are distributed up and down, and a driving arm mechanism is movably connected between the two ends of the first tensioning roller and the second tensioning roller, which is driven by the forward movement of the moving mechanism which is slidably connected with the two groups of vertical plates to adjust the distance between the first tensioning roller and the second tensioning roller, thereby adjusting the tensioning force of the PVC film; The middle part between the two groups of vertical plates is connected with a first guide roller and a second guide roller distributed up and down. A bracket is vertically slidably connected at the rear between the two groups of vertical plates, and a winding roller is installed on the top through a clamping mechanism. A rotating jacking mechanism is provided on the outer wall of the rear of the vertical plate. When the moving mechanism moves forward, the rotating jacking mechanism is pulled to rotate through the limiting mechanism sliding on the horizontal plate, so that the bracket drives the winding roller to move upward to tension the PVC film. When the bracket is moved to the highest position, the clamping mechanism automatically opens, and after the winding roller shaft that passes through the middle of the winding roller is placed inside the clamping mechanism, the clamping mechanism automatically closes under the action of the gravity of the winding roller, thereby clamping the winding roller shaft; When the rotating mechanism at the rear end of the limiting mechanism rotates, the rotating lifting mechanism is pulled to rotate, so that the bracket drives the winding roller to move upward to tension the PVC film; The two ends of the horizontal plate are provided with mounting plates, which are fixed to the inner wall of the vertical plate by bolts. The moving mechanism includes a cylinder body installed in the middle of the upper end of the horizontal plate, a horizontal frame connected to the output end of the cylinder body, a connecting seat provided at the front end of the horizontal frame, and a sliding seat connected to the bottom of the two ends of the horizontal frame. The sliding seat is slidably connected to the first sliding groove on the side wall of the vertical plate; The driving arm mechanism comprises a first sleeve sleeved on a first shaft rod at both ends of a first tensioning roller, a first connecting ring connected to the lower end of the first sleeve by a first connecting arm, a second sleeve sleeved on a second shaft rod at both ends of a second tensioning roller, and two sets of second connecting rings connected to the upper end of the second sleeve by a second connecting arm; The first connecting ring is movably connected between the two sets of second connecting rings through a connecting pin, and both ends of the connecting pin extend through both sides of the connecting seat; A vertical groove is provided on the front side walls of the two sets of vertical plates, and the first shaft rod and the second shaft rod extend into the vertical groove; The limiting mechanism comprises two sets of limiting seats arranged in parallel, the front end of the limiting seat is provided with a U-shaped groove which is slidably connected to the horizontal plate, and the front end of the limiting seat is fixed with an end cover by screws, which is fixedly connected to the inner rear end of the corresponding sliding seat by a first rope; The rotating mechanism includes a rotating shaft passing through the rear parts of the two sets of limit seats, one end of which passes through the second sliding groove on the corresponding vertical plate and is fixedly connected to a winding wheel, and the other end passes through the second sliding groove on the corresponding vertical plate and is fixed with a gear, a winding wheel and a hand wheel in sequence.

2. The automatic tensioning mechanism according to claim 1, characterized in that: The vertical plate is provided with a third sliding groove located above the second sliding groove, and a moving plate is slidably connected inside, and a clamping tooth for clamping on the front end of the gear is provided at the rear end of the bottom of the moving plate.

3. The automatic tensioning mechanism according to claim 1, characterized in that: The rotating lifting mechanism comprises a rotating lifting arm movably connected to the outer side wall of the vertical plate through a pin shaft, and the front end of the bottom thereof is connected to the winding wheel through a second rope; The top of the rear part of the vertical plate is provided with a notch, and two groups of front and rear vertical plates are provided inside the notch, and the vertical part of the bracket is slidably connected between the two groups of front and rear vertical plates, and a long rod is fixed inside the top of the rotating lifting arm, which is slidably connected in the fourth slide groove on the vertical part of the bracket; A limiting plate is provided at the rear portion of the outer side of the notch, which is used to prevent the rotating lifting arm from continuing to rotate counterclockwise after the rotating lifting arm rotates to a vertical state.

4. The automatic tensioning mechanism according to claim 3, characterized in that: The clamping mechanism includes a clamping seat, the rear side of the bottom of which is connected to the right-angle groove on the front side of the top end of the vertical part of the bracket through a spring, and the bottom of the clamping seat is movably connected between two sets of connecting plates on the right-angle groove through a pin; A clamping groove is provided on the rear end surface of the vertical part of the right-angle groove, an arc groove is provided on the rear end of the clamping seat, a supporting plate is fixed on the front end of the clamping seat, and a raised plate is provided on the front end of the top of the rear vertical plate, and the supporting plate is located below the raised plate.

5. A PVC film winding device, characterized in that: It comprises an automatically adjusting tensioning mechanism as claimed in any one of claims 1 to 4.

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